Edge detection

Besides the high fidelity sensing of local edge position & orientation, it is also possible to derive from SHV (during the same pipeline processing) the local sharpness of the edge relative to a reference sharpness. This relative sharpness measure is effectively the ‘Visual Efficiency’ as defined, discussed & justified in Chapter 10.3.5 of ‘Vision and Acquisition’ - a measure which has been found to be very robustly related to both subjective & objective sharpness sensing by human vision.

In image analysis I believe that ability to measure such a parameter is potentially capable of permitting differentiation between ‘real’ and ‘shadow’ edges (and is believed to be sub-consciously used for such purposes in human vision), as is discussed in Chapter 7.3 and with relation to Figure 15.11 of ‘Computer Vision ...’.